iterabletype.php

<?php
function xrange($start, $limit, $step = 1) {
    for ($i = $start; $i <= $limit; $i += $step) {
        yield $i;
    }
}

function iterate(iterable $iter)
{
    foreach ($iter as $val) {
        echo $val, ' ';
    }
}
// Print: 1 2 3 4 5 6 7 8 9 10
iterate(xrange(1, 10));